int in_addr_to_string(int family, const union in_addr_union *u, char **ret);
int in_addr_from_string(int family, const char *s, union in_addr_union *ret);
int in_addr_from_string_auto(const char *s, int *family, union in_addr_union *ret);
+unsigned in_addr_netmask_to_prefixlen(const struct in_addr *addr);
static inline size_t FAMILY_ADDRESS_SIZE(int family) {
assert(family == AF_INET || family == AF_INET6);